In the combination of the following gates the output Y can be written in terms of inputs A and B as
In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB, IC and β are given by
IB = 40 μA, IC = 10 mA, β = 250
IB = 25 μA, IC = 5 mA, β = 200
IB = 40 μA, IC = 5 mA, β = 125
IB = 20 μA, IC = 5 mA, β = 250
C.
IB = 40 μA, IC = 5 mA, β = 125
VBE = 0,
Vi = 20 V
VCE = 0
Vb = 0 (earthed)
Ic =
Or
Vi = 0 + IBRB
In a p-n junction diode, change in temperature due to heating
Affects only reverse resistance
Affects only forward resistance
Affects the overall V - I characteristics of p-n junction
Does not affect resistance of p-n junction
In forward biased if the p-n junctions diode is forward biased, then width of potential barrier in p-n junction diode
remains constant
increase
decrease
None of these
The slope of plate characteristic and mutual characteristic curves of a triode valve is 0.02 mA / V and 1 mA / V. The amplification factor of triode valve is
20
50
40
In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt, the collector current changes by 0.05 mA. The output resistance will be
10 kΩ
20 kΩ
5 kΩ
2.5 kΩ
The amplification factor of a triode valve is 15. If the grid voltage is changed by 0.3 V, the change in plate voltage in order to keep the current constant (in volt) is :
0.02
0.002
4.5
5.0
Zener diode is used for
producing oscillations in an oscillator
amplification
stabilisation
rectification